Electrical apparatus



M. NEUNER ELECTRICAL APPARATUS Filed Feb. 7, 1941 Sept. 22, '1942.

)15 112 :56 INSULATMN Patented Sept. 22, 1942 PATENT OFFICE ELECTRICAL APPARATUS Martin Neuner, rum", N. 1., aaaignor to Bendix Aviation Corporation, South Bend, 11111., a cornotation of Delaware Application February '1, i941, Serial No. 377,918

1 Claim.

This invention relates to electrical apparatus, and particularly to electro-magnetic circuitcontrollers.

An object of the invention is to provide a novel method of assuring uniform contact action as between the stationary and movable elements of circuit make-and-break devices actuated by electro-magnetic means.

A further object is to provide circuit controlling mechanisms of novel construction.

These and other objects of the invention willv become apparent from inspection of the following specification when read with reference to the accompanying drawing wherein is illustrated the preferred embodiment of the invention. It is to be expressly understood, however, that the drawing is for the purpose of illustration only, and is not designed as a definition of the limits of the invention, reference being had to the appended claim for this purpose.

In the drawing:

Figs. 1, 2 and 3 are perspective and elevation views of a device embodying the invention; and

Fig. 4 is a wiring diagram of circuits to which the novel circuit-controlling mechanism is applicable in the manner indicated.

In the drawing an L-shaped bracket 5| is shown as disposed with its longer leg in horizontal position, to receive the core 56 of an electromagnet having a heavy wire 51 wound thereon to form a single coil source of excitation of the magnetic circuit, of which the bracket 5|, the core 56, and the armature 5| constitute major component parts. Armature 5| is pivotally mounted on the vertical leg of bracket 5|, and carries a counter-weight 99, beneath which is suspended a tensioning spring whose pull is adjustable by the turning of a screw Ill! mounted in bracket llll. This bracket llll has a detent. I93 engageable with a notched wheel I04 forming part of the adjusting screw assembly, the detent thus serving to lock the screw in adjusted position.

The novel circuit-controlling mechanism includes contact elements carried by the armature 5| on opposite'sides of the bracket 5|; one being carried on the under surface of the armature, adjacent counter-weight 99, and the other being in the form of a triangular prism 9| having a shank l2 apertured to receive a suspension bar 83 integrated with, and extending outwardly from, the central portion 95 of the armature assembly, and thus indirectly carried by the armature 6|; the bar 83 having no surface contact with armature member it. A sleeve N of insulating material surrounds the bar 83, and is retained by metal cap it, having a forced fit thereon. The contact element first referred to is designated by reference character 91 and its complementary contact element by reference character 9|; the latter being integrated with a screw I! extending down through threaded openings in guide-piece 9|, and having a head and nut 91 at its lowerend to adjust the contact action. The guide-piece 9| is insulated from bracket II, as is also the conductor terminal 93, from which terminal connection is made to the pilot light'L (Fig. 3).

The novel circuit-controlling mechanism further includes a pair of outwardly flaring contact plates I95, ill with vertical portions held to spacer plate ll. of insulating material by bolts "9 (which bolts also clamp the insulating plates Ill, Hi to the assembly) and with horizontal portions held flush against insulating bed-plate 2 by suitable bolts H4, H5, which bolts also act as conductor terminals for the wires, H6, ill (see Fig. 3).

With the-construction indicated absolute accuracy and perfection in switch assembly and operation are assured, as the plates I05, I01 can be formed in a jig-fixture so as to be uniform in length, width and angularity; and the wedge 8| is free to swing to offset any imperfection in the armature construction or assembly.

When the invention is applied to the control of a battery-generator combination, as shown in Fig. 3, it will function as follows:

When generator G is first started the fiow of current through winding 51 will not be sufflciently heavy to attract armature 5| against the opposing force of counter-weight 99, and therefore the current will pass to the battery B (or load) by way of rectifier R. The subsequentv rise in current strength will increase the magnetic strength through core 56 and draw wedge ll into contact with plates I95, I91, thereby closing a by-pass circuit, around the rectifier R, to the battery and load. At the same time the withdrawal of contact 8'! from contact 88 will extinguish the pilot light L, signifying that battery-charging is now in progress. The subsequent slowing down or stopping of the generator will allow weight 99 to reopen the switch lfli, Ill, and re-close switch 81, II, to re-light the pilot L; but no reverse flow from the battery to the generator will occur, as the rectifier R is unidirectional in its action. The re-lighting of pilot L warns the attendant that battery charg- 121% has ceased, and that the generator s nor producing its normal amount of power.

By the combination shown there is eliminated my need 0:? a, second winding on the relay W, with its resultant tendency to produce more or less constant vibration or the armature. Home the contacts will remain firmly engaged ior reloiiveiy long periods, and excessive wear, well as erretic moize-emi-breoir action, avoided.

What isolaimed is:

m as magnetic switch, a pair or mglfleriy disposed contacts, on ormome norms e'orlizodriooi extension, e triangular 13mm or current con-- ducting materiel, esid prism having an. aperiureci shank to receive said cylindrical armature extension, wherefore said armature extension constitutes the sole mounting for said prism, and upon which extension said prism is freely suspended for pivotal movement about the axis oi said armature extension, current responsive means for causing said armature to move said prism into engagement with said onguiarly disposed contacts, and means for preventing any lateral shifting of sold prism independently of rotation i hereoi about, said armature extension axis.

NE'UNER. 

